Abstract
It has been shown that delayed bit-interleaved coded modulation (BICM) performs better than the original BICM in some scenarios. This paper is intended to enhance the performance of low-density parity-check (LDPC) coded spatial modulation. To this end, we present the delayed bit-interleaved coded spatial modulation (DBICSM) when LDPC codes are employed. The resulting transmission scheme is termed LDPC-DBICSM. Firstly, we present the encoding structure of the LDPC-DBICSM. Secondly, we present a non-iterative decoder that works only on two blocks of received sequences for the LDPC-BICSM. Thirdly, we present an estimated lower bound on the performance of the LDPC-DBICSM. Finally, we present extensive simulation results to show the performance advantages of the LDPC-DBICSM when compared to the LDPC-BICSM. Particularly, a performance gain of about 1.25 dB is obtained at a bit error rate (BER) of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-8</sup> .
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